Abstract: An ink of this invention contains a self-dispersible pigment having a phosphonic acid group bonded directly or through another atomic group to the surface of the self-dispersible pigment, polyurethane resin particles, a monovalent inorganic salt, and water.

Abstract: An ink including a self-dispersible pigment, acrylic resin particles, a water-soluble organic solvent, and water. The self-dispersible pigment includes a phosphonic-acid-based self-dispersible pigment having a phosphonic acid group bonded directly or via another atomic group to a surface of particles of the pigment. The acrylic resin particles are formed of an acrylic resin containing a constituent unit derived from an ester-bond-containing monomer. The content of the constituent unit derived from the ester-bond-containing monomer in the acrylic resin is 60 mol % or more based on the total of the acrylic resin.

Abstract: An ink includes a self-dispersing pigment, polyurethane resin particles, a surfactant, and water. The self-dispersing pigment is a pigment having a phosphonic acid group bonded directly or via another atomic group to a surface thereof.

Abstract: Provided is an ink containing a pigment, a water-soluble organic solvent, and a surfactant., and having a viscosity at 25° C. of 5 mPa·s or more. The ink has a static surface tension of 30.5 mN/m or more to 35.0 mN/m or less, which is measured at 25° C. by a Wilhelmy method. The ink also has a dynamic surface tension at a bubble life time of 150 msec of 30.5 mN/m or more to 37.0 mN/m or less, which is measured at 25° C. by a maximum bubble pressure method.

Abstract: Provided is Ink including a pigment, a resin, a water-soluble organic solvent, and water, wherein a solid content of first liquid as prepared by diluting the ink 500-fold with water and by adding CaCl2 at a concentration of 1.5 mM has a rate of aggregation of 1.5 nm/second or less; and a solid content of second liquid as prepared, after the ink has been stored at 60° C. for 2 weeks, by diluting the ink 500-fold with water and by adding CaCl2 at a concentration of 5 mM has a rate of aggregation of 2.0 nm/second or more.

Abstract: An ink including a self-dispersible pigment, acrylic resin particles, a water-soluble organic solvent, and water. The self-dispersible pigment includes a phosphonic-acid-based self-dispersible pigment having a phosphonic acid group bonded directly or via another atomic group to a surface of particles of the pigment. The acrylic resin particles are formed of an acrylic resin containing a constituent unit derived from an ester-bond-containing monomer. The content of the constituent unit derived from the ester-bond-containing monomer in the acrylic resin is 60 mol % or more based on the total of the acrylic resin.

Abstract: Provided is an ink containing a pigment, a water-soluble organic solvent, and a surfactant represented by the following general formula (1), and having a viscosity at 25° C. of 5 mPa·s or more. The ink has a static surface tension of 27.1 mN/m or more and 35.0 mN/m or less, which is measured at 25° C. by a Wilhelmy method. The ink also has a dynamic surface tension at a bubble life time of 150 msec of 30.5 mN/m or more and 37.0 mN/m or less, which is measured at 25° C. by a maximum bubble pressure method.

Abstract: There is provided an ink including a pigment, resin particles, a surfactant, water-soluble organic compound, and water, in which: the content of the water-soluble organic compounds is 35 mass % or less based on a total mass of the ink; the water-soluble organic compound contains a first water-soluble organic compound being liquid at 25° C. and having a surface tension at 25° C.

Abstract: An ink jet image recording method includes applying a first ink and a second ink onto a recording medium. The first ink contains a surfactant expressed by general formula (1) with a content of V1 percent by mass relative to the total mass of the first ink and a liquid X being the portion other than the surfactant, and the second ink contains the surfactant with a content of V2 percent by mass lower than V1 relative to the total mass of the second ink and a liquid Y being the portion other than the surfactant. The liquids X and Y satisfy the specific requirement, and when liquids X? and Y? are prepared by adding the surfactant to the liquid X and Y, respectively, to a content of V2 percent by mass relative to the total mass of the respective liquids, the liquids X? and Y? satisfy a specific requirement.

Abstract: An ink containing a self-dispersing pigment, polyurethane resin particles, a surfactant, and water, wherein the self-dispersing pigment is a pigment having a phosphonate group bonded directly or via another atomic group to the surface of the pigment, wherein the polyurethane resin particles have an anionic functional group content of 0.1 mmol/g or more and 0.4 mmol/g or less on the surfaces of the polyurethane resin particles and have a volume average particle size of 10.0 nm or more and 50.0 nm or less, and the surfactant includes a surfactant represented by a general formula (1), wherein the amount of the surfactant represented by the general formula (1) is 0.05 times or more and 1.00 times or less the amount of the polyurethane resin particles.

Abstract: Provided is an ink containing a self-dispersible pigment, an acrylic resin particle, a surfactant, a water-soluble organic solvent, and water. The surfactant includes a fluorinated surfactant represented by Formula (1) and having an HLB value determined by a Griffin method of 11 or less. The water-soluble organic solvent includes at least one water-soluble organic solvent selected from a specific group, and the total content of the water-soluble organic solvents of the specific group is 4 times or more the total content of the water-soluble organic solvents other than the solvents of the specific group. The total content of the self-dispersible pigment and the acrylic resin particle is 10% by mass or less based on the total mass of the ink.

Abstract: An image recording method includes a conveyance process for conveying a recording medium and an ink-applying process for applying a first ink and a second ink to the recording medium, wherein the first ink and the second ink contain a surfactant represented by Formula (1), the amount of the surfactant represented by Formula (1) in the first ink is greater than the amount of the surfactant represented by Formula (1) in the second ink, and a liquid X prepared by removing the surfactant represented by Formula (1) from the first ink and a liquid Y prepared by removing the surfactant represented by Formula (1) from the second ink satisfy a particular condition.

Abstract: An ink includes a self-dispersing pigment, polyurethane resin particles, a surfactant, and water. The self-dispersing pigment is a pigment having a phosphonic acid group bonded directly or via another atomic group to a surface thereof.

Abstract: An ink of this invention contains a self-dispersible pigment having a phosphonic acid group bonded directly or through another atomic group to the surface of the self-dispersible pigment, polyurethane resin particles, a monovalent inorganic salt, and water.

Abstract: An ink containing a self-dispersing pigment, polyurethane resin particles, a surfactant, and water, wherein the self-dispersing pigment is a pigment having a phosphonate group bonded directly or via another atomic group to the surface of the pigment, wherein the polyurethane resin particles have an anionic functional group content of 0.1 mmol/g or more and 0.4 mmol/g or less on the surfaces of the polyurethane resin particles and have a volume average particle size of 10.0 nm or more and 50.0 nm or less, and the surfactant includes a surfactant represented by a general formula (1), wherein the amount of the surfactant represented by the general formula (1) is 0.05 times or more and 1.00 times or less the amount of the polyurethane resin particles.

Abstract: An ink jet image recording method includes applying a first ink and a second ink onto a recording medium. The first ink contains a surfactant expressed by general formula (1) with a content of V1 percent by mass relative to the total mass of the first ink and a liquid X being the portion other than the surfactant, and the second ink contains the surfactant with a content of V2 percent by mass lower than V1 relative to the total mass of the second ink and a liquid Y being the portion other than the surfactant. The liquids X and Y satisfy the specific requirement, and when liquids X? and Y? are prepared by adding the surfactant to the liquid X and Y, respectively, to a content of V2 percent by mass relative to the total mass of the respective liquids, the liquids X? and Y? satisfy a specific requirement.

Abstract: An ink including: a pigment dispersed with a polymer dispersant; polymer particles; a surfactant; a water-soluble organic solvent; and water, wherein the amount of anionic functional group on the surface of the polymer particles is 0.2 mmol/g or less, the surfactant is represented by the general formula (1) and contains a fluorinated surfactant having a hydrophile-lipophile balance (HLB) of 11 or less as determined by a Griffin method, and the water-soluble organic solvent contains at least one water-soluble organic solvent selected from glycerin, ethylene glycol, diethylene glycol, poly(ethylene glycol) having a weight-average molecular weight of 10,000 or less, 1,3-propanediol, 1,4-butanediol, and diglycerol.

Abstract: Provided is an ink containing a self-dispersible pigment, a polyurethane polymer particle, a surfactant, a water-soluble organic solvent, and water. The surfactant includes a fluorinated surfactant represented by Formula (1) and having an HLB value determined by a Griffin method of 11 or less. The water-soluble organic solvent includes at least one water-soluble organic solvent selected from a specific group, and the total content of the water-soluble organic solvents of the specific group is higher than the total content of the water-soluble organic solvents other than the solvents of the specific group.

Abstract: An ink including: a self-dispersing pigment; polymer particles; a surfactant; a water-soluble organic solvent; and water, wherein the amount of anionic functional group on the surface of the polymer particles is 0.2 mmol/g or less, the surfactant is represented by the general formula (1) and contains a fluorinated surfactant having a hydrophile-lipophile balance (HLB) of 11 or less as determined by a Griffin method, and the water-soluble organic solvent contains at least one water-soluble organic solvent selected from glycerin, ethylene glycol, diethylene glycol, poly(ethylene glycol) having a weight-average molecular weight of 10,000 or less, 1,3-propanediol, 1,4-butanediol, and diglycerol.

Abstract: An ink contains a pigment dispersed with polymer, a surfactant, a water-soluble organic solvent, and water. The mass ratio of a content of the pigment to a content of the polymer in the ink is more than 3. The surfactant includes a fluorinated surfactant which is represented by Formula (1) and which has an HLB of 11 or less as determined by a Griffin method. The water-soluble organic solvent includes at least one selected from specific Group A. The total content of the water-soluble organic solvents of the Group-A in the ink is larger than the total content of water-soluble organic solvents other than the water-soluble organic solvents of Group A in the ink.